<!DOCTYPE html>
<html lang="en">
 
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <meta http-equiv="X-UA-Compatible" content="ie=edge">
        <title>CSS 3.0实现音阶加载中动画</title>
        <style>
            * {
                margin: 0;
                padding: 0;
                font-family: "微软雅黑"
            }
 
            body {
                display: flex;
                align-items: center;
                justify-content:center;
                min-height: 100vh;
                background: #000;
            }
 
            .step {
                position: relative;
                -webkit-box-reflect: below -12px linear-gradient(transparent, rgba(0, 0, 0, 0.2))
            }
 
            .step span {
                position: relative;
                display: inline-block;
                color: #fff;
                font-size: 2em;
                animation: animate 1s ease-in-out infinite;
                animation-delay: calc(.1s*var(--i))
            }
 
            @keyframes animate {
                0% {
                    transform: translateY(0px)
                }
 
                20% {
                    transform: translateY(-24px)
                }
 
                40%,
                100% {
                    transform: translateY(0px)
                }
            }
        </style>
    </head>
 
    <body>
        <div class="step">
            <span style="--i:1">内</span>
            <span style="--i:2">容</span>
            <span style="--i:3">加</span>
            <span style="--i:4">载</span>
            <span style="--i:5">中</span>
            <span style="--i:6">.</span>
            <span style="--i:7">.</span>
            <span style="--i:8">.</span>
        </div>
    </body>
 
</html>